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113 lines
3.4 KiB
113 lines
3.4 KiB
class Company
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# connect to postgres
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DB = PG.connect({:host => "localhost", :port => 5432, :dbname => 'contacts'})
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def self.all
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results = DB.exec(
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<<-SQL
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SELECT
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companies.*,
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people.id AS person_id,
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people.name AS person_name,
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people.age
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FROM companies
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LEFT JOIN jobs
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ON companies.id = jobs.company_id
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LEFT JOIN people
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ON jobs.person_id = people.id;
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SQL
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)
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companies = []
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last_company_id = nil;
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results.each do |result|
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if result["id"] != last_company_id
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company = {
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"id" => result["id"].to_i,
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"name" => result["name"],
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"industry" => result["industry"],
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"employees" => []
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};
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companies.push(company)
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last_company_id = result["id"]
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end
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if result["person_id"]
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companies.last["employees"].push({
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"id" => result["person_id"].to_i,
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"name" => result["person_name"],
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"age" => result["age"].to_i,
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})
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end
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end
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return companies
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end
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def self.find(id)
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results = DB.exec(<<-SQL
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SELECT
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companies.*,
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people.id AS person_id,
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people.name AS person_name,
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people.age
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FROM companies
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LEFT JOIN jobs
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ON companies.id = jobs.company_id
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LEFT JOIN people
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ON jobs.person_id = people.id
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WHERE companies.id=#{id};
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SQL
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)
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employees = [];
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results.each do |result|
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if result["person_id"]
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employees.push({
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"id" => result["person_id"].to_i,
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"name" => result["person_name"],
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"age" => result["age"].to_i,
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})
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end
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end
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return {
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"id" => results.first["id"].to_i,
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"name" => results.first["name"],
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"industry" => results.first["industry"],
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"employees" => employees
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}
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end
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def self.create(opts={})
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results = DB.exec(
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<<-SQL
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INSERT INTO companies (name, industry)
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VALUES ( '#{opts["name"]}', '#{opts["industry"]}' )
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RETURNING id, name, industry;
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SQL
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)
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return {
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"id" => results.first["id"].to_i,
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"name" => results.first["name"],
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"industry" => results.first["industry"]
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}
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end
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def self.delete(id)
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results = DB.exec("DELETE FROM companies WHERE id=#{id};")
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return { "deleted" => true }
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end
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def self.update(id, opts={})
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results = DB.exec(
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<<-SQL
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UPDATE companies
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SET name='#{opts["name"]}', industry='#{opts["industry"]}'
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WHERE id=#{id}
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RETURNING id, name, industry;
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SQL
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)
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return {
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"id" => results.first["id"].to_i,
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"name" => results.first["name"],
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"industry" => results.first["industry"]
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}
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end
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end
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